CN1325611C - Process for sulfur reduction in naphtha streams - Google Patents

Process for sulfur reduction in naphtha streams Download PDF

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Publication number
CN1325611C
CN1325611C CNB028246136A CN02824613A CN1325611C CN 1325611 C CN1325611 C CN 1325611C CN B028246136 A CNB028246136 A CN B028246136A CN 02824613 A CN02824613 A CN 02824613A CN 1325611 C CN1325611 C CN 1325611C
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Prior art keywords
boiling range
naphtha
pressure naphtha
mercaptan
hydrobon catalyst
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CNB028246136A
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Chinese (zh)
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CN1604956A (en
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威利布罗德·A·格罗滕
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催化蒸馏技术公司
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G67/00Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only
    • C10G67/16Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural parallel stages only
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G19/00Refining hydrocarbon oils in the absence of hydrogen, by alkaline treatment
    • C10G19/02Refining hydrocarbon oils in the absence of hydrogen, by alkaline treatment with aqueous alkaline solutions
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G45/00Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
    • C10G45/02Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G65/00Treatment of hydrocarbon oils by two or more hydrotreatment processes only
    • C10G65/02Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
    • C10G65/04Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only refining steps
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2400/00Products obtained by processes covered by groups C10G9/00 - C10G69/14
    • C10G2400/02Gasoline

Abstract

A process for fractionating and treating of a full range naphtha stream. The full boiling range naphtha stream is first split into a light boiling range naphtha, an intermediate boiling range naphtha and a heavy boiling range naphtha. The bottoms are subjected to hydrodesulfurization and the effluent combined with the intermediate boiling range naphtha containing thiophene and thiophene boiling range mercaptans and subjected to a second hydrodesulfurization. The effluent from the polishing reactor may be combined with the light boiling range naphtha to produce a new full boiling range naphtha containing substantially less total sulfur than the original feed. The mercaptans in the light naphtha may be removed by thioetherification prior to splitting or by wet caustic wash afterwards. The object being to meet higher standards for sulfur removal, by treating the components of the naphtha feed with the process that preserves the olefinic while most expediently removing the sulfur compounds.

Description

Reduce the method for sulphur in the naphtha stream

Invention field

The present invention relates to the method for a kind of while fractionation and the full boiling range naphtha stream of hydrotreatment.More particularly, full boiling range naphtha stream is separated into hydrogen boiling range naphtha stream, middle boiling range naphtha stream and heavy boiling range petroleum naphtha.Handle the total sulfur content of each boiling range naphtha stream respectively to realize that bonded is wished.

Relevant information

Contain various organic chemistry components in the petroleum distillation logistics.Usually, logistics can determine that by them the boiling range of forming defines.The processing of logistics also influences composition.For example, come the product of catalytic cracking or thermocracking process to contain the olefin feed of high density and saturated (alkane) material and poly-unsaturated material (diolefine).In addition, these components can be the various arbitrarily isomer of described compound.

Mainly be subjected to the influence of crude petroleum sources as composition from the untreated naphtha of crude still or virgin naphtha.Petroleum naphtha from the paraffinic crude source contains more saturated straight chain or ring compound.Usually, most " low-sulfur " (low-sulfur) crude oil and petroleum naphtha are paraffinic bases.Naphthenic base crude contains more unsaturated cyclic and polynuclear compound.The crude oil of higher sulfur content is cycloalkyl often.The processing of different virgin naphthas is slightly different, depends on them because the difference that crude petroleum sources causes is formed.

Reformed naphtha or reformate do not need other processing usually, unless possible distillation or solvent extraction are used to remove valuable aromatic product.Reformed naphtha is not because the harshness of technology pre-treatment and technology itself thereof has amounts of sulphur contaminants basically.

When pressure naphtha Tathagata catalytic cracking device, has high relatively octane value, because wherein include alkene and aromatics.In some cases, this cut can provide in the refinery tank up to half gasoline and the octane value of signal portion is provided.

Usually form the significant part (≈ 1/3) of gasoline products jar at U.S.'s catalytic cracking petroleum naphtha gasoline boiling range material, it provides the sulphur of largest portion.Sulphur impurity needs to remove, and meets the environmental regulation requirement by hydrotreatment with index or the assurance of satisfying product usually.

Removing the usual method of sulphur compound is by hydrogenating desulfurization (HDS), and its PetroChina Company Limited.'s distillate is by containing the solid particle catalyst of load hydrogenation metal on the alumina host.A large amount of in addition hydrogen are included in the charging.Following equation illustrates the unitary reaction of typical HDS:

(1) RSH+H 2→RH+H 2S

(2) RCl+H 2→RH+HCl

(3) RN+2H 2→RH+NH 3

(4) ROOH+2H 2→RH+2H 2O

It is as follows that HDS reacts typical operational condition:

Temperature, ℃ 315.6-415.6 (600~780 )

Pressure, MPa 4.14-20.7 (600~3000psig)

H 2Cycle rate, m 3/ m 3(270.2-540.3 1500~3000 SCF/bbl)

The fresh H that replenishes 2, m 3/ m 3(126.07-180.1 700~1000 SCF/bbl)

Organosulfur compound and hydrogen generate H in the refinery stream on catalyzer 2The reaction of S is commonly referred to hydrogenating desulfurization.Hydrotreatment be one than the generalized term, comprise that the saturated and organic nitrogen compound reaction of alkene and aromatics forms ammonia.But hydrogenating desulfurization is included in and simply is called hydrotreatment sometimes.

After hydrotreatment is finished, product can by fractionation or simply flash distillation to discharge hydrogen sulfide and to collect the petroleum naphtha of desulfurization.

Except the high-octane rating blending compound was provided, pressure naphtha was usually as other technologies source olefins in the etherificate for example.The hydrotreated naphtha cut to be to remove some olefin(e) compounds in the also saturated cut of condition of desulfuration, reduced the loss that octane value has caused source alkene.

Proposed various being proposed to be used in and kept the alkene that need more except that desulfuration.Because alkene in pressure naphtha mainly is those petroleum naphthas of low boiler cut, the impurity that contains sulphur often is concentrated in the high boiling fraction, and usual method is to carry out prefractionation before hydrotreatment.Prefractionation can obtain boiling point at C 5The light boiling range petroleum naphtha of~about 121.11 ℃ (250 ) and boiling point are at the heavy boiling range petroleum naphtha of about 121.11-246.11 ℃ of (250~475 ) boiling point.

Main light or more lower boiling sulphur compound is a mercaptan, and the compound of heavier or higher is thiophene and other heterogeneous ring compounds.Separate by fractionation separately and can not remove mercaptan.But mercaptan is removed by the oxidising process that comprises the caustic alkali washing usually in the past.In U.S. Pat 5,320, oxidation removal mercaptan is disclosed with aftercut and the hydrotreatment combined method than last running in 742.Remove in the mercaptan in oxidation, mercaptan is converted into corresponding disulphide.

Remove the mercaptan than the petroleum naphtha of light fraction except handling, lighter fraction is also as entering the unitary raw material of catalytic reforming to increase octane value, if necessary usually.Simultaneously, lighter cut is also through further separating to remove the valuable C that is used to prepare ether 5Alkene (amylene).

Handle simultaneously and fractionation comprise petroleum naphtha particularly the method for catalytic cracking petroleum naphtha (FCC petroleum naphtha) petroleum products be disclosed in US 5,510, in 568,5,597,476,5,779,883,5,807,477 and 6,083,378.

US 5,510, for example disclose the full boiling range FCC petroleum naphtha of hydrotreatment in separation column in 568, and wherein said separation column is included in the catalyst for etherification on top.Mercaptan in lighting end reacts (thioetherification) to produce the sulfide of higher with the diolefine that is included in wherein, and described sulfide shifts out with heavy (high boiling point) FCC petroleum naphtha as the low product of tower.

Have been found that the thiophene that the light FCC petroleum naphtha that just is lower than lighting end that cuts also contains mercaptan and obviously measures in separation column.Mercaptan in this cut is removed by thioetherification.Sulphur content total in the thiophene cut is low relatively, does not more significantly need processing harsh as sulphur compound in the last running to make thiophene be converted into H 2S, so the olefin fraction in the thiophene is more impossible by hydrogenation.

Advantage of the present invention is that sulphur can be removed to heavier part logistics from the logistics of light olefin part, and loses without any tangible alkene.Basically the sulphur in all heavier parts is converted into H by thioetherification 2S easily distills from hydrocarbon.Simultaneously, the sulphur in the middle runnings also is lowered.

Summary of the invention

Briefly, the present invention is a kind of by separating the light fraction logistics and handling the petroleum naphtha component, remove the method for desulfuration from the fluid cracking journey petroleum naphtha that boils entirely, to satisfy the higher requirement for the sulphur removal standard, this method can keep alkene can bestly remove sulphur compound simultaneously.

Preferred the inventive method comprises the steps:

(a) logistics of full boiling range pressure naphtha is separated into three kinds of cuts, comprises that the preferred boiling range of light pressure naphtha cut is C 5~about 65.56 ℃ (150 ), the preferred boiling range of middle pressure naphtha cut is about 121.11 ℃ of about 65.56-(about 150~about 250 ), and the preferred boiling range of heavy pressure naphtha is about 121.11-232.22 ℃ (about 250~450 );

(b) heavy pressure naphtha being carried out hydrogenating desulfurization in containing first hydrodesulphurisatioreactors reactors of hydrotreating catalyst handles; And

(c) will combine from the effluent and the middle pressure naphtha of first hydrodesulphurisatioreactors reactors, hydrogenating desulfurization is carried out in the bonded logistics in second hydrodesulphurisatioreactors reactors.

The advantage of this system is to reduce the size and the capital investment of hydrogenating desulfurization distillation tower.The mercaptans content from the hydrogenating desulfurization distillation tower of reorganization has been reduced.At last, because the relatively mild processing of rich olefins thiophene cut may be saved octane value.

The accompanying drawing summary

Fig. 1 is the simplification schematic flow sheet of one embodiment of the present invention.

Fig. 2 is the simplification schematic flow sheet that the present invention has thioetherification pre-treatment embodiment in addition.

Detailed Description Of The Invention

Process feeds comprises the petroleum fractions that contains sulphur, and its boiling point is in the gasoline boiling range.Such charging comprises that boiling range is about C 5The light naphthar of~165.56 ℃ (330 ) and boiling range are C 5The full boiling range naphtha stream of~215.56 ℃ (420 ).Usually this method is used for the petroleum naphtha boiling range material from the cat cracker product, because they contain the alkene and the unwanted sulphur compound of needs.Virgin naphtha has considerably less olefin feed, and, unless this crude petroleum sources is " acid (sulfur-bearing) ", contain considerably less sulphur.

The sulphur content of catalytic cracking cut depends on the sulphur content of cracker charging and selects the boiling range of cut as this process feeds.The more high boiling cut of lighter cut contains lower sulphur content.The front-end volatiles of petroleum naphtha contain most high octane olefins, but sulphur relatively seldom.Sulphur component in front-end volatiles mainly is a mercaptan, and typically these compounds are: methyl mercaptan (b.p.6.1 ℃ (43 )), ethanethio (b.p.37.22 ℃ (99 )), n-propyl mercaptan (b.p.67.78 ℃ (154 )), isopropyl mercaptan (b.p.57.22-60 ℃ (135~140 )), isobutyl-mercaptan (b.p.87.78 ℃ (190 )), tert-butyl mercaptan (b.p.63.89 ℃ (147 )), normal-butyl mercaptan (b.p.97.78 ℃ (208 )), sec-butyl mercaptan (b.p.95 ℃ (203 )) and 3-mercapto hexane (b.p.57.22 ℃ (135 )).Usually the typical sulfur compound of finding in heavier boiling point fraction comprises heavier mercaptan, thiophene sulfide and disulphide.

The reaction of the alkene that contains in these mercaptan and the petroleum naphtha is called thioetherification, and product is the sulfide of higher.Being used for the suitable catalyzer of diolefine and thiol reactant is the Pd that is carried on the 0.4wt% on 7~14 order alumina globules, and this catalyzer is provided by Sud-Chemie, and name is called G-68C-1.The typical physics of catalyzer and the chemical property that are provided by manufacturers are as follows:

Table I

Title G-68C-1

The form sphere

Nominal size 7 * 12 orders

Pd?wt% 0.4±0.03

Carrier high purity aluminium oxide (99.0~99.5)

The catalyzer that another kind is used for the mercaptan-alkene hydrocarbon reaction is a Ni silica extrudate, and this catalyzer is provided by Sud-Chemie, and name is called C46-7-03RS.The typical physics of catalyzer and the chemical property that are provided by manufacturers are as follows:

Table II

Title C46-7-03RS

The form extrudate

Nominal size 1/16 "

Niwt% 52±4

The carrier silica

Enter the speed of reactor hydrogen must be enough keeping reaction, but described hydrogen speed as used in the present invention term should be understood that " finishing the hydrogen amount of reaction ".Hydrogen was at least 1.0: 1.0 with the ratio of diolefine and acetylene in the charging, was preferably 2.0: 1.0.

The method that is suitable for removing mercaptan in addition from light naphthar is the wet caustic wash method.In this method, light naphthar contacts with caustic alkali.Mercaptan is dissolved as water-based caustic alkali phase.Thiol reactant forms disulphide then.The amount of the mercaptan that extracts is subjected to the restriction of mercaptan solubleness in the caustic solution.

The catalyzer that is used for hydrodesulfurization reaction comprises VIII family metal for example cobalt, nickel, palladium, is used in combination separately or with other metals such as molybdenum or tungsten, is carried on the appropriate carriers such as aluminum oxide, silica-alumina, oxidation titania-zirconia.Usually metal provides as the metal oxide that is carried on extrudate or the bead, just because of this usually not as distillation structure.

Catalyzer comprises and is selected from V in the periodic table of elements, VIB, VIII family metal component or its mixture.Use Distallation systm can reduce inactivation, and can provide than fixed bed hydrogenation unit longer working time in the prior art.VIII family metal can increase total average activity.Contain group vib metal such as molybdenum and VIII family metal for example the catalyzer of cobalt or nickel be preferred.Suitable Hydrobon catalyst comprises Co-Mo, Ni-Mo and Ni-W catalyzer.Metal usually be carried on matrix for example the oxide compound on aluminum oxide, the silica-alumina etc. exist.Be sulfide in use or before by contacting metallic reducing with the logistics that contains sulphur compound.But catalyzer also catalysis is contained in alkene and polyene hydrocarbon hydrogenation in the light pressure naphtha, and reaches lower degree, i.e. some monoolefine generation isomerization.Gently, particularly the monoolefine in the lighter fraction may be undesirable.

The typical preferred condition of thioetherification comprises temperature 76.67-204.4 ℃ (170~400 ) in standard downflow fixed bed reactor, pressure be 0.999-1.998MPa (145~290psig), liquid hourly space velocity be 1~10 volume petroleum naphtha/catalyst volume/hour.

Table III illustrates the performance of typical Hydrobon catalyst.

Table III

Manufacture criterion catalyst co.

Title C-448

Form trifolium extrudate

Nominal size 1.2mm diameter

Metal wt%

Co 2~5%

Mo 5~20%

Alumina catalyst support

Catalyzer is typically the form of extrudate, and diameter is 1/8,1/16 or 1/32 inch, and L/D is 1.5~10.Catalyzer also has the form of same diameter ball.They can directly be packed in the straight-through fixed-bed reactor of standard, and described reactor comprises supporter and reactant distribution structures.

Only the reaction conditions that removes desulfuration in the straight-through fixed-bed reactor of standard is that temperature is 260-371.1 ℃ (500~700 ), and pressure is 2.756-6.89MPa (400~1000psig).The residence time that is expressed as liquid hourly space velocity typically is 1.0~10 usually.Petroleum naphtha in the straight-through fixed bed reaction depends on that temperature and pressure can be liquid phase or gas phase, and the flow velocity of adjusting total pressure and hydrogen is to realize that the hydrogen dividing potential drop is 0.689~4.823MPa (100~700psig).The operation of straight-through fixed bed hydrogenation desulfurization is well known in the art in addition.

With reference to figure 1, simply illustrate the schema of schematic form of one embodiment of the present invention.Petroleum naphtha enters in the naphtha splitter 10 by pipeline 101.Contain most of C 5Light naphthar take out as overhead product by flowline 102.Light naphthar also contains most mercaptan and a spot of other organosulfur compounds.Boiling range is C 6The medium naphtha of~about 148.89 ℃ (300 ) by flowline 104 as sideing stream taking-up.Medium naphtha contains main thiophene and some mercaptan.Boiling range is that the heavy naphtha of 148.89~232.2 ℃ (300~450 ) takes out as the low product of tower by pipeline 106.Heavy naphtha can contain some thiophene but contain organosulfur compound than heavy boiling range basically, and more definite term is called other organosulfur compounds.

Light naphthar in the flowline 102 is handled removing mercaptan in reactor 20 with wet caustic wash, and takes out with main raw material as tert pentyl methyl ether technology as product by flowline 103.The low product of tower in the flowline 106 uses the hydrogen that is used for this technology that adds through flowline 107 to carry out hydrogenating desulfurization at reactor 40.In reactor 40, all basically thiophene and most other organosulfur compounds are converted into hydrogen sulfide, can be removed at an easy rate by flash distillation or distillation.The effluent of reactor 40 combines with medium naphtha in the flowline 104, is admitted in second hydrodesulphurisatioreactors reactors 30, wherein adds hydrogen by flowline 105 and is used to make with extra care.Basically thiophene in the medium naphtha and the residue organosulfur compound in the heavy naphtha are converted into hydrogen sulfide.The bonded petroleum naphtha takes out from reactor 30 by flowline 109.

With reference to figure 2, illustrated second embodiment.All petroleum naphtha is sent in the thioetherification reaction device 20 by flowline 101, and wherein diolefine in the petroleum naphtha and thiol reactant generate sulfide.The effluent of reactor 20 is sent in the naphtha splitter 10 by flowline 102, and wherein petroleum naphtha is three kinds of cuts by fractionation.Contain most of C 5Light naphthar take out as overhead product by flowline 103.Because in the thioetherification reaction device, removed mercaptan, contained considerably less organosulfur in the light naphthar.Boiling range is C 6The medium naphtha of~about 148.89 ℃ (300 ) by flowline 104 as sideing stream taking-up.Medium naphtha contains main thiophene and some mercaptan.Boiling range is that the heavy naphtha of 148.89~232.2 ℃ (300~450 ) takes out as the low product of tower by pipeline 106.Heavy naphtha can contain some thiophene but contain organosulfur compound than heavy boiling range basically, and more definite term is called other organosulfur compounds.

The low product of tower in the flowline 106 uses the hydrogen that is used for this technology that adds through flowline 107 to carry out hydrogenating desulfurization at reactor 40.In reactor 40, all basically thiophene and most other organosulfur compounds are converted into hydrogen sulfide, can be removed at an easy rate by flash distillation or distillation.The effluent of reactor 40 combines with medium naphtha in the flowline 104, is admitted in second hydrodesulphurisatioreactors reactors 30, wherein adds hydrogen by flowline 105 and is used to make with extra care.Basically thiophene in the medium naphtha and the residue organosulfur compound in the heavy naphtha are converted into hydrogen sulfide.The bonded petroleum naphtha takes out from reactor 30 by flowline 109.

Claims (6)

1. a method that reduces organic sulfur content from the full boiling range pressure naphtha logistics that contains alkene, diolefine, mercaptan, thiophene and other organosulfur compounds comprises the steps:
(a) be three kinds of cuts with full boiling range pressure naphtha logistics fractionation, comprise that light pressure naphtha cut boiling range is C5~65.56 ℃, middle pressure naphtha cut boiling range is 65.56 ℃~121.11 ℃, and heavy pressure naphtha boiling range is 121.11 ℃~232.22 ℃;
(b) heavy pressure naphtha is carried out hydrogenating desulfurization in containing first hydrodesulphurisatioreactors reactors of Hydrobon catalyst;
(c) will combine from the effluent and the middle pressure naphtha of first hydrodesulphurisatioreactors reactors, make the bonded logistics in second hydrodesulphurisatioreactors reactors, carry out hydrogenating desulfurization; And
(d) described light pressure naphtha is handled through wet caustic wash, the mercaptan that wherein contains is converted into sulfide.
2. method as claimed in claim 1, wherein said Hydrobon catalyst comprises the group VIII metal.
3. method as claimed in claim 2, wherein said Hydrobon catalyst comprise the combination of independent cobalt, nickel, palladium or itself and other metal.
4. method as claimed in claim 2, wherein said Hydrobon catalyst comprises the component of the V family, group vib, group VIII or its mixture that come from the periodic table of elements.
5. method as claimed in claim 4, wherein said Hydrobon catalyst comprises cobalt-molybdenum, nickel-molybdenum or nickel-tungsten.
6. method as claimed in claim 5, wherein said Hydrobon catalyst are carried on aluminum oxide, silica-alumina or the oxidation titania-zirconia.
CNB028246136A 2001-06-20 2002-11-04 Process for sulfur reduction in naphtha streams CN1325611C (en)

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